---
title: Why your CommBox S4 or S5 screen might turn off automatically
description: Is your CommBox screen turning off by itself? Learn the top 8 reasons why and how to fix or prevent unwanted shutdowns.
---

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# Why your CommBox S4 or S5 screen might turn off automatically

## Understand the common reasons your CommBox screen may shut down on its own, and how to check or adjust these settings to keep your screen running as expected.

Applies to: CommBox Classic S4 &S4+, CommBox Classic S5

#### **Step 1: Check for Scheduled Power Off**

Open the swipe-up device menu.  
Go to **Power \> Schedule power on/off**.  
Look for any active schedules that may be turning the screen off at specific times.

💡 *Tip: Disable or adjust the schedule to suit your school or business hours.*

#### **Step 2: Check for Android Power Save Settings**

Open the swipe-up device menu.  
Go to **Power \> Android power save**.  
Check if Android Power Save is enabled with "Power Off " or "Backlight Off"

✅ *These settings help reduce power use but can turn off the screen unexpectedly if idle.*

#### **Step 3: Confirm ‘No Signal’ Power Off Setting**

Open the swipe-up device menu.  
Navigate to **Power \> No Signal Power Save**.  
If this is enabled, the screen will power off after a set time without an active input.

📝 *Connect a device or disable this setting to prevent shutdowns when removing an input source. You can set this option to "Switch to Android" if you want the CommBox to remain in a powered on state*

#### **Step 4: Check RS232 or IP Control Commands**

If your screen is connected to a room control system (e.g. via RS232 or network), it may be receiving a shutdown command.

- Contact your IT/AV team to review any automation or control scripts.
- Disable RS232/IP control temporarily to test if the issue stops.

🔌 *Common in classrooms and boardrooms using centralised AV control.*

#### **Step 5: Check for Motion Sensor (Body Detection) with the CommBox Sensor Box**

If a sensor box is installed (usually mounted near the front inputs of the panel), it may turn the screen off if no movement is detected after a period.

- The sensor may be configured to reduce power consumption when no one is in the room.
- You can disable the sensor box sleep after inactivity in the Swipe up \> **Power** Tab

#### **Step 6: Slot-in-PC (OPS) Shutdown**

If you're using an OPS (Slot-in PC), shutting down the PC can cause the screen to turn off.

- Ensure the screen is set to stay on even if the OPS shuts down.
- Go to **Swipe Up Menu \> Power \> On PC Shutdown** and check input preferences.

💻 *Also check Windows power settings on the OPS to prevent it going to sleep.*

#### **Step 7: Sleep Mode**

The screen may be in sleep mode, not actually off.

- Press the power button on the screen or remote to wake it.
- Look for a pulsing red and white light on the power LED – this indicates Sleep Mode.

🌙 *If the light is solid red, it’s on standby. If it’s off completely, the power switch may be off.*

#### **Step 8: Check HDMI-CEC Settings**

If a connected device supports HDMI-CEC, it might be sending a shutdown signal to the screen.

- Open **Swipe Up Menu \> Other \> HDMI CEC**
- Disable this feature if you're not using HDMI-CEC to control the screen.

📺 *CEC is a handy feature, but it can also trigger shutdowns when devices like when Apple TVs are turned off.*

### **Troubleshooting / What to Do If It Doesn’t Work**

- **The screen turns off even after all settings are reviewed:**
  
    - Perform a factory reset (take a photo of the current settings if you want to replicate them)
    - Update firmware if an update is available
    - Contact CommBox Support if the issue persists
      
          - Log a ticket via the [CommBox Support Portal](https://support.commbox.com.au/knowledge/kb-tickets/new?hsLang=en)
- **Need help accessing the Inputs menu?**
  
    - You can swipe up from the bottom middle of the screen at any time to access the inputs menu
    - Alternatively you can tap on the side menu and then tap on the inputs icon on the floating bottom bar (Between the brightness slider and the lock screen icon)<https://support.commbox.com.au/knowledge/kb-tickets/new?hsLang=en>

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